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Re: representation of struct field offsets

From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
To: mark at codesourcery dot com
Cc: clattner at apple dot com, dberlin at dberlin dot org, gcc at gcc dot gnu dot org, sandra at codesourcery dot com
Date: Sat, 30 Sep 2006 08:25:34 EDT
Subject: Re: representation of struct field offsets
References: <451B2DA5.8070504@codesourcery.com> <451C33F8.6090900@codesourcery.com> <D9F9CDE8-279E-44EE-AB11-EC4C00994042@apple.com> <10609290211.AA20506@vlsi1.ultra.nyu.edu> <4aca3dc20609290654y3f3bca8br3e31d094af824080@mail.gmail.com> <10609292224.AA05432@vlsi1.ultra.nyu.edu> <451DC110.5010107@codesourcery.com>

> That doesn't explain why the bit value isn't normalized to be smaller 
> than BITS_PER_UNIT; any whole bytes could be incorporated into the 
> variably sized offset.

It can't be normalized to BITS_PER_UNIT, but to DECL_OFFSET_ALIGN since
we are asserting that DECL_FIELD_OFFSET is aligned to DECL_OFFSET_ALIGN.

See stor-layout.c: normalize_offset.

References:
- representation of struct field offsets
  - From: Sandra Loosemore
- Re: representation of struct field offsets
  - From: Mark Mitchell
- Re: representation of struct field offsets
  - From: Chris Lattner
- Re: representation of struct field offsets
  - From: Richard Kenner
- Re: representation of struct field offsets
  - From: Daniel Berlin
- Re: representation of struct field offsets
  - From: Richard Kenner
- Re: representation of struct field offsets
  - From: Mark Mitchell

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